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// Ref 1: https://codex.wordpress.org/Post_Types
// Ref 2: https://codex.wordpress.org/Function_Reference/register_post_type

// Place this code in funcitons.php
add_action( 'init', 'create_posttype_service' );
function create_posttype_service() {
    register_post_type( 'services', array(
        'labels' => array(
            'name' => __( 'Services' ),
            'all_items' => __( 'All Services' ),
            'singular_name' => __( 'Service' )
        ),
        'public' => true,
        'query_var' => true,
        'has_archive' => true,
        'rewrite' => array('slug' => 'services'),
        'supports'  => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
    ));
}